31Accordingly, if the conduct of undertakings is to be subject to the prohibition in principle laid down in Article 101(1) TFEU, that conduct must not only reveal the existence of coordination between them — in other words, an agreement between undertakings, a decision by an association of undertakings or a concerted practice –, but that coordination must also have a negative and appreciable effect on competition within the internal market (see, to that effect, judgment of 13 December 2012, Expedia, C‑226/11, EU:C:2012:795, paragraphs 16 and 17).
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